260 Mr. T. D. A. Cockerell — Descriptions and 



of metathorax much smaller, little flattened, and without any 

 evident rim, strongly but quite sparsely punctate, and with a 

 very deep and large pit ; abdomen more shining and more 

 coarsely punctured, the first segment with large moderately 

 close punctures of uniform size (minute dense punctures and 

 scattered larger ones in triangulifera) ; hind margins of 

 segments ferruginous hyaline ; tarsi and apical part of tibiae 

 ferruginous. 



Bab. Dallas, Texas {Boll) : Berlin Museum, no. 21286. 



Halictus supercretus, sp. n. 



$ . — Length 10 mm.- or slightly over. 



Black, little shining, densely and very minutely punctured, 

 with broad even bands of very pale yellowish tomentum on 

 bases of abdominal segments 2 to 4 ; hind spur so minutely 

 serrate as to seem simple ; face elongate, clypeus projecting, 

 long da.k fuscous hairs projecting from its lower margin; 

 antennae dark, flagelluin faintly reddish beneath; tegulse 

 piceous; nervures fuscous, stigma dull ferruginous. Wings 

 dusky ; area of metathorax hardly defined, dull, with hardly 

 noticeable short subbasal striae j truncation of metathorax 

 dull, not strongly bounde 1. 



In Crawford's table in Journ. N. Y. Ent. Soc, Dec. 1907, 

 Jl is runs to //. bardus, from which it is distinguished by 



any characters. Among Vachal's Mexican species it comes 



the group of //. crocoturus &c, but it does not agree with 

 of his descriptions. It is also distinct from Smith's 

 xican species, the types of which I have seen. In its 

 .use fine sculpture it is like II. manitonellus, Ckll., but the 

 face is much longer than in that species and the first two 

 abdominal bands are not l educed in the middle. The longer 

 and much less shining face, longer eyes, &c. readily separate 

 it from H. trizonatus. The cheeks and occiput are con- 

 spicuously clothed with white hair ; there is no bright coloured 

 hair on the thorax. 



Hab. Mexico (Deppe) : Berlin Museum, no. 2583. 



A species closely allied to the more northern 11. trizonatus, 

 coriaceus, &c. 



Andrena colletina, Ckll. 



This species has hitherto been known from a single male. 

 Two males and a female are in the Berlin Museum, collected 

 in Colorado many years ago by Morrison. The female closely 

 resembles the male, but has a broader (width about 4£ mm.) 

 abdomen. The intervals between the broad hair-bands on 



